package servlets.admin.userManagement;

import dbProcs.Setter;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.owasp.encoder.Encode;
import utils.ShepherdLogManager;
import utils.Validate;

/**
 * This class is the control structure of the Create class vulnerability <br>
 * <br>
 * This file is part of the Security Shepherd Project.
 *
 * <p>The Security Shepherd project is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software Foundation, either
 * version 3 of the License, or (at your option) any later version.<br>
 *
 * <p>The Security Shepherd project is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE. See the GNU General Public License for more details.<br>
 *
 * <p>You should have received a copy of the GNU General Public License along with the Security
 * Shepherd project. If not, see <http://www.gnu.org/licenses/>.
 *
 * @author Mark Denihan
 */
public class CreateClass extends HttpServlet {

  private static final long serialVersionUID = 1L;
  private static final Logger log = LogManager.getLogger(CreateClass.class);

  /**
   * Initiated by createClass.jsp. Class is added to the system if valid data has been submitted.
   * Otherwise no class is added to the core database schema. Adding of class to Core Database is
   * handed by Setter.createClass
   *
   * @param className Name of the new class
   * @param classYear Class's year, in the format YY/YY, eg 11/12
   * @param csrfToken
   */
  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    // Setting IpAddress To Log and taking header for original IP if forwarded from proxy
    ShepherdLogManager.setRequestIp(request.getRemoteAddr(), request.getHeader("X-Forwarded-For"));
    log.debug("*** servlets.Admin.createClass ***");

    PrintWriter out = response.getWriter();
    out.print(getServletInfo());
    request.setCharacterEncoding("UTF-8");
    HttpSession ses = request.getSession(true);
    Cookie tokenCookie = Validate.getToken(request.getCookies());
    Object tokenParmeter = request.getParameter("csrfToken");
    if (Validate.validateAdminSession(ses, tokenCookie, tokenParmeter)) {
      ShepherdLogManager.setRequestIp(
          request.getRemoteAddr(),
          request.getHeader("X-Forwarded-For"),
          ses.getAttribute("userName").toString());
      if (Validate.validateTokens(tokenCookie, tokenParmeter)) {
        boolean notNull = false;
        boolean notEmpty = false;
        boolean validYear = false;
        boolean classValidate = false;
        try {
          log.debug("Getting ApplicationRoot");
          String ApplicationRoot = getServletContext().getRealPath("");
          log.debug("Servlet root = " + ApplicationRoot);

          log.debug("Getting Parameters");
          String className = (String) request.getParameter("className");
          log.debug("className = " + className);
          String classYear = (String) request.getParameter("classYear");
          log.debug("classYear = " + classYear);

          // Validation
          log.debug("Checking for nulls");
          notNull = (classYear != null && className != null);
          log.debug("Ensuring strings are not empty");
          notEmpty = (!classYear.isEmpty() && !className.isEmpty());
          log.debug("Validating Year");
          validYear = Validate.isValidClassYear(classYear);
          log.debug("Validating Name");
          classValidate = className.length() > 4 && className.length() <= 32;

          if (notNull && notEmpty && validYear && classValidate) {
            String reponseMessage = new String();
            // Data is good, Add user
            log.debug("Adding class to database");
            if (Setter.classCreate(ApplicationRoot, className, classYear)) {
              reponseMessage =
                  "<h3 class=\"title\">Class Created</h3>"
                      + "<p>"
                      + "Class <a>"
                      + Encode.forHtml(className)
                      + "</a> of <a>"
                      + Encode.forHtml(classYear)
                      + "</a> created successfully."
                      + "</p>";
            } else {
              reponseMessage =
                  "<h3 class=\"title\">Class Create Failure</h3><p>Sorry but an error Occurred!"
                      + " Please try again. If the problem persists please contact an"
                      + " administrator!<p>";
            }
            out.print(reponseMessage);
          } else {
            // Validation Error Responses
            String errorMessage = "An Error Occurred: ";
            if (!notNull || !notEmpty) {
              log.error("Null values detected");
              errorMessage += "Invalid Request. Please try again";
            } else if (!validYear) {
              log.error("Invalid Year Detected");
              errorMessage +=
                  "Invalid Year submitted. Should be in format \"YY/YY\", eg; \"11/12\".";
            } else if (!classValidate) {
              log.error("Invalid Class Name");
              errorMessage += "Invalid Class Name. Please try again";
            }
            out.print(
                "<h3 class=\"title\">Class Create Failure</h3>"
                    + "<p><font color=\"red\">"
                    + Encode.forHtml(errorMessage)
                    + "</font><p>");
          }
        } catch (Exception e) {
          log.error("Create New Class Error: " + e.toString());
          out.print(
              "<h3 class=\"title\">Class Create Failure</h3>"
                  + "<p>"
                  + "<font color=\"red\">An error Occurred! Please try again.</font>"
                  + "<p>");
        }
      } else {
        log.debug("CSRF tokens did not match");
        out.print(
            "<h3 class=\"title\">Class Create Failure</h3>"
                + "<p>"
                + "<font color=\"red\">An error Occurred! CSRF Tokens did not match.</font>"
                + "<p>");
      }
    } else {
      out.print(
          "<h3 class=\"title\">Class Create Failure</h3><p><font color=\"red\">An error Occurred!"
              + " Please try non administrator functions!</font><p>");
    }
    log.debug("*** createClass END ***");
  }
}
